AP Biologymediummcq1 pt
Why does DNA move toward the positive electrode in gel electrophoresis?
A.Phosphate groups give DNA a negative charge
B.DNA is positively charged
C.The gel is magnetic
D.DNA is repelled by the buffer
Explanation
Core Concept
Each nucleotide's phosphate carries a negative charge, so the electric field pulls whole DNA molecules toward the anode.
Correct Answer
APhosphate groups give DNA a negative charge
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